CHARGING APPARATUS, CONTROL METHOD THEREFOR, AND CHARGING SYSTEM

Embodiments of this application provide a charging apparatus, a charging apparatus control method, and a charging system, and relate to the field of terminal device charging technologies, to avoid problems such as a short circuit or an open circuit that occurs when a voltage of a clamp capacitor is excessively high. The charging apparatus includes a rectifier circuit, a transformer, a lower bridge switch, a clamp capacitor, an upper bridge switch, and a controller. The transformer includes a primary coil and at least one secondary coil. The controller is configured to control the upper bridge switch and the lower bridge switch to be alternatively turned on. The controller is further configured to: when the lower bridge switch is turned off, obtain a sampling waveform at a location at which the controller is electrically connected to the transformer; and when the sampling waveform is abnormal, turn off the lower bridge switch in a first phase of a next charging cycle. The sampling waveform includes a voltage waveform of the primary coil or a voltage waveform of the secondary coil.